负压

负压是医院和医疗中心用来阻止不同病房之间交叉感染的一种隔离技术[1][2]。负压需要一种能使病房对外施加的压力低于周围环境对病房的压力的排风装置，带有负压效果的病房称为负压病房。空气在流入负压病房后，不会从负压病房中逸出，因为空气会自然地从压力较高的区域流向压力较低的区域，因此负压病房能阻止含有病菌的空气从病房中逸出[3][4]。

负压病房内原本空气被排出，从而负压病房内成为负气压状态，此时外界空气进入负压病房

参考文献

Negative Room Pressure to Prevent Cross-Contamination, Clean Air Solutions, Camil Farr, （页面存档备份，存于）Retrieved 2010-03-10.
Isolation Rooms & Pressurization Control （页面存档备份，存于）, Penn State Department of Architectural Engineering, © 2008 The Pennsylvania State University. Retrieved 2010-03-10.
Negative Pressure Isolation Rooms & Tuberculosis (TB) Isolation Rooms, AirMont Inc. Retrieved 2010-03-10. （页面存档备份，存于）
Hoffman, P. N.; Weinbren, M. J.; Stuart, S. A. . The Journal of Hospital Infection. 2004, 57 (4): 345–6. PMID 15262397. doi:10.1016/j.jhin.2004.04.013.

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[camil-1] Negative Room Pressure to Prevent Cross-Contamination, Clean Air Solutions, Camil Farr, （页面存档备份，存于）Retrieved 2010-03-10.

[2] Isolation Rooms & Pressurization Control （页面存档备份，存于）, Penn State Department of Architectural Engineering, © 2008 The Pennsylvania State University. Retrieved 2010-03-10.

[3] Negative Pressure Isolation Rooms & Tuberculosis (TB) Isolation Rooms, AirMont Inc. Retrieved 2010-03-10. （页面存档备份，存于）

[4] Hoffman, P. N.; Weinbren, M. J.; Stuart, S. A. . The Journal of Hospital Infection. 2004, 57 (4): 345–6. PMID 15262397. doi:10.1016/j.jhin.2004.04.013.